The role of return keyword in php (including detailed explanation)

The role of return keyword in php

1. Terminate script execution

<?php
echo &#39;锄禾日当午<br>&#39;;
return;//终止脚本执行
echo &#39;汗滴禾下土<br>&#39;;//不执行

*Reminder: return can only interrupt the current page. If there is an included file, it can only interrupt the included file.

Example:

demo.php

<?php
echo &#39;锄禾日当午<br>&#39;;
require &#39;./test.php&#39;;    //包含文件
echo &#39;汗滴禾下土<br>&#39;;

test.php

<?php
echo &#39;aaa<br>&#39;;
return;   //只能中断test.php
echo &#39;bbb<br>&#39;;

Running result

锄禾日当午
aaa
汗滴禾下土

If you want to terminate completely Script execution, use exit(), or die()

echo &#39;aaa<br>&#39;;
exit();  //die()
echo &#39;bbb<br>&#39;;

2, return page results

Example:

test.php

<?php
return array(&#39;name&#39;=>&#39;tom&#39;,&#39;sex&#39;=>&#39;男&#39;);

demo.php

<?php
$stu=require &#39;./test.php&#39;;
print_r($stu);  //Array ( [name] => tom [sex] => 男 )

Summary: Use this method to introduce configuration files into the project.

3. Return and termination of function

return is used in functions:

⑴ Terminate function execution

function fun() {
echo 'aaa';
return ;  //终止函数执行
echo 'bbb';
}
fun();   //aaa

⑵ Return value

function fun() {
return 10;  //返回值
}
echo fun();  //10

Recommended tutorial: "PHP Tutorial"

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